[Zope] FSSession and delete cookie

Hi, How can delete cookie from browser using FSSession? I've tried all the combination but I did not succeed to find a right solution? <dtml-call FSSession.del('main_counter')> not-work <dtml-call "FSSession.del('main_counter')"> inv-syntax ..... .... Any suggestion? Thank's __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com